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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 11-16-2012, 08:17 PM
Imrandrew Imrandrew is offline
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N54 or N55?

I own a BMW 335i convertible e93. 2010
How do I know if it's has a N54 or N55 engine?is it pre-lci or lci?
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  #2  
Old 11-16-2012, 08:24 PM
Squidget Squidget is offline
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http://en.wikipedia.org/wiki/335i

It's all there. Enjoy.
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  #3  
Old 11-17-2012, 04:01 AM
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boramkiv boramkiv is offline
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Or type the last seven digits of your VIN here:

http://www.realoem.com/bmw/select.do
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  #4  
Old 11-17-2012, 04:36 AM
bmw325 bmw325 is offline
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2010 was pre lci. You have the n54
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  #5  
Old 11-17-2012, 07:46 AM
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bear-avhistory bear-avhistory is offline
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Or just count the turbos.
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  #6  
Old 11-17-2012, 10:01 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by bear-avhistory View Post
Or just count the turbos.

Too direct and much too dirty.

I say: Fire a very strongly worded letter to BMWNA demanding clear designation of which engine you have.
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  #7  
Old 11-17-2012, 10:51 AM
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andrew b andrew b is offline
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One of them has big lettering on the engine cover that says "TwinPower Turbo".

That's the N55, with one turbo (although it does have twin scrolls).




The plain one is the N54, with twin turbos:

Last edited by andrew b; 11-17-2012 at 10:56 AM.
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  #8  
Old 11-17-2012, 11:14 AM
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Bemo Bemo is offline
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According to the Bentley manual, several states received SULEV version, post LCI, labeled something like N52N (California, Connecticut....). Can anyone confirm this?
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  #9  
Old 11-26-2012, 09:32 AM
bmw325 bmw325 is offline
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Quote:
Originally Posted by Bemo View Post
According to the Bentley manual, several states received SULEV version, post LCI, labeled something like N52N (California, Connecticut....). Can anyone confirm this?
Sounds right but that would be the silver version of the n52 (used in the 328i)
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  #10  
Old 12-07-2012, 09:41 AM
farrout farrout is offline
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Take key to BMW Dealer. They can run a vehicle history report for you. When I was looking for a 335 to buy, I took numerous VIN numbers to the local dealer and they gave me details about the car itself.
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  #11  
Old 12-07-2012, 10:21 AM
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CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Bemo View Post
According to the Bentley manual, several states received SULEV version, post LCI, labeled something like N52N (California, Connecticut....). Can anyone confirm this?
Better late than never, sure, I'll confirm it.

Has a special pollution fighting radiator coating.....believe it....almighty expensive too.
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  #12  
Old 12-07-2012, 10:40 AM
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  #13  
Old 12-07-2012, 09:15 PM
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What, me?

Dude! Better do a check - does indeed have the coating.
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  #14  
Old 12-07-2012, 09:51 PM
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MP3_E46 MP3_E46 is offline
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The info from this amazed me. Was totally spot on http://bmwvin.com

Is there more lag on the single turbos? I Googled twin-scroll and it seems to be all about efficiency; still has one turbine so presumably it'll take longer to spool up
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Last edited by MP3_E46; 12-07-2012 at 09:55 PM.
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  #15  
Old 12-08-2012, 07:09 AM
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This has been debated to death, not sure there is a solid answer on lag. Pretty much any lag can be tuned out of the N54. The one thing that is a fact based on development dyno tests by Burger Motorsports is the N54 is much more adaptable to power modification then the N55. With identical tunes the N55 will always lag behind the N54 on the dyno & at the track. Why this is I don't have any idea but it might be more then just the turbo because the top horsepower N54's, 650+whp, are all after market single turbos cars.
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  #16  
Old 12-08-2012, 10:11 AM
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MP3_E46 MP3_E46 is offline
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Quote:
Originally Posted by bear-avhistory View Post
This has been debated to death, not sure there is a solid answer on lag. Pretty much any lag can be tuned out of the N54. The one thing that is a fact based on development dyno tests by Burger Motorsports is the N54 is much more adaptable to power modification then the N55. With identical tunes the N55 will always lag behind the N54 on the dyno & at the track. Why this is I don't have any idea but it might be more then just the turbo because the top horsepower N54's, 650+whp, are all after market single turbos cars.
One day I have to buy a used 335 and boost to over 400hp just for kicks.. maybe in a year or two I'll find one with a clogged intake that someone is letting go for next to nothing. Many are starting to hit 100K now
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  #17  
Old 12-08-2012, 10:38 AM
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SD Z4MR SD Z4MR is offline
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Quote:
Originally Posted by MP3_E46 View Post
The info from this amazed me. Was totally spot on http://bmwvin.com
Did you check the horsepower spec? My M was off by 84 HP and my wife's 335is was off by 60 HP. They must be using some metric spec.
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  #18  
Old 12-08-2012, 11:00 AM
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bear-avhistory bear-avhistory is offline
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BMW cheats usually down on the BHP ratings for the less expensive versions. Keeps an artificial spread among the various lines.
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  #19  
Old 12-08-2012, 12:28 PM
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MP3_E46 MP3_E46 is offline
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Quote:
Originally Posted by SD Z4MR View Post
Did you check the horsepower spec? My M was off by 84 HP and my wife's 335is was off by 60 HP. They must be using some metric spec.
It's kw. Darn Continental Europe.
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